How to Restart a Single Container with Docker Compose

TLDR

To restart a single container in a Docker Compose setup, use the docker compose restart <service_name> command. This allows you to restart a specific service without disrupting others.

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Docker Compose simplifies managing multi-container applications. However, there are times when you need to restart just one container without affecting the rest. Here's how to do it.

Step 1: Identify the Service Name

The service name is defined in your compose.yaml file. Locate the service you want to restart. Originally, this file is named docker compose.yml, but it can also be named compose.yaml in newer versions which is the recommended format.

Example compose.yaml

services:
  web:
    image: nginx
    ports:
      - '80:80'
  db:
    image: postgres
    environment:
      POSTGRES_PASSWORD: example

In this example, the service names are web and db.

Step 2: Restart the Service

Use the docker compose restart command followed by the service name.

Command

docker compose restart web

Explanation

• docker compose restart web: Restarts only the web service.
• Other services, like db, remain unaffected.

Step 3: Verify the Restart

Check the status of your containers to ensure the service restarted successfully.

Command

docker compose ps

Example Output

   Name                  Command               State           Ports
----------------------------------------------------------------------------
project_web_1   nginx -g 'daemon off;'        Up      0.0.0.0:80->80/tcp
project_db_1    docker-entrypoint.sh postgres Up      5432/tcp

The State column should show Up for the restarted service.

Best Practices

• Use Descriptive Service Names: Clearly name your services in docker compose.yml.
• Monitor Logs: Use docker compose logs <service_name> to debug issues after a restart.
• Minimize Downtime: Restart services during low-traffic periods if possible.

By following these steps, you can efficiently restart individual containers in a Docker Compose setup, ensuring minimal disruption to your application.